body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #f4f4f4;
    padding: 20px;
    text-align: center;
}

main {
    flex: 1;
    padding: 20px;
}

footer {
    background-color: #f4f4f4;
    text-align: center;
    padding: 10px;
}